Air leak from inside switch cover box

by Steve Redmill
(Jasper, Alabama, US)

Air is leaking from inside the black box under the on/off switch. Can it be repaired. 10 gal 115 psi model. Model ZJ304SA. Are parts available?

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Aug 27, 2017
ZJ304SA leaking air
by: Bill

Is air leaking from the "switch box" (pressure switch) while the compressor is running, or when the compressor has stopped, or both?

If it's leaking while the compressor is running, it is likely the pressure switch has a problem with the unloader valve.

If air is leaking from the pressure switch when the compressor is off, then you have a failed or failing compressor tank check valve.

Please see the troubleshooting page on this site which has links to pages providing lots of info about these compressor problems.

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